本标准涵盖监护转移流动液体密度的连续在线测定和应用。本标准涵盖液体和密相流体，包括:天然气液体、精炼产品、化学品、原油和石油工业中常见的其他液体产品。本文件不适用于天然气、液化天然气、多相混合物、半固态液体（如沥青）以及固体（如焦炭和泥浆）的密度测量。本标准还提供了设计、安装、操作和验证监护转移连续在线密度测量系统的标准和程序。本标准还讨论了各种应用的不同精度等级和要求。 本标准（API MPMS第9.4章，动态（流动）条件下的连续密度测量，第一版）取代API MPMS第14.6章，连续密度测量，第二版（已撤销）。

This standard covers the continuous on-line determination and application of flowing liquid densities for custody transfer. This standard covers liquid and dense phase fluids, including: natural gas liquids, refined products, chemicals, crude oil, and other liquid products commonly encountered in the petroleum industry. This document does not apply to the density measurement of natural gas, LNG, multiphase mixtures, semi-solid liquids such as asphalt, and solids such as coke and slurries.This standard also provides criteria and procedures for designing, installing, operating, and proving continuous on-line density measurement systems for custody transfer. This standard also discusses the different levels and requirements of accuracy for various applications.This standard, API MPMS Chapter 9.4, Continuous Density Measurement Under Dynamic (Flowing) Conditions, First Edition, supersedes API MPMS Chapter 14.6, Continuous Density Measurement, Second Edition, which is withdrawn.